Calcining-furnace



(No Model.) 2 Sheets-Sheet 1.

P. PROTZMAN, O. ADA1VIS &'A. LONGMORE. GALGINING FURNACE.

No. 256,162. Batented Apr .1:1,1882.

1 2 95555 fizzle/ hi3 2% M W (No Model.) '2 Sheets- -Sheet 2.-

P. PROTZMAN, 'c. ADAMS & A. LONGMORE. GALGINING FURNACE.

No. 256,162. Patented Apr. 11,1882.

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. I at UNITED STATES PATENT OFFICE.

FERDINAND PROTZMAN, or ALLEGHENY, PA, CHARLES ADAMs, on ST. LOUIS, MO.,AND ALFRED LONGMORE, on ALLEGHENY, PA.

CALC lNlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 256,162,'dated April11, 1882.

Application filed April 23, 1881.

To all whom it may concern:

Be it known that we, FERDINAND Pno'rz- MAN and ALFRED LONGMORE, residingat Allegheny, in the county of Allegheny, State of Pennsylvania, andCHARLES ADAMS, residing at St. Louis, county of St. Louis, State ofMissouri, citizens of the United States of America, have inventedcertain new and useful Improvements in Galcining-Furnaces; and we dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the'art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon ,which form a part of this specification.

Our invention relates to a furnace for dephosphorizing iron ores; and itconsists in an arrangement by which hydrogen, set free, being brought incontact with phosphoric acid eliminated byheat from the ore, combineswith the phosphorus of the acid, thereby becoming phosph'ureted, and isthen carried off with other gaseous products, leaving the ore free fromphosphorus, as will be more fully described hereinafter.

Theaccompanying drawings'represent our invention.

Figure l is a vertical end section of the furnace. Fig. 2 is a verticalside section of the same.

E represents the chamber in which the ore I is placed; D, chambers forburning the fuel;

and ,0 are flues to convey the heat to the ore in E. The outlet-holes Bare for the escape of phosphureted hydrogen and othersimultaneously-eliminated gases from the ore when brought to the propertemperature.

A are steampipes, perforated by small holes at short distances from eachother, by which jets of steam or watery vapor are thrown into thefurnace.

The inclined gratings or bars shown at the bottom of the ore-chambers Eare to allow an (No model.)

upward passage of air through the column of ore placed thereon.

We prefer the furnaces to be of small dimensions-say four feetacrosssince,by itthe discharge of the phosphureted hydrogen isaccelerated, which is an essential feature in our process, and the.number of open escape holes should always correspond with the greater orless quantity of steam introduced for a particular kind of ore.

To increase, when necessary, the volume of steam or vapor, we placealternate layers of green wood, previously saturated with watercontaining chloride of sodium of about 10 Baum, under and between theore; but we operate either with or without the chloride, as the case mayrequire.

To successfully operate our furnace we proceed as follows: After fillingthe furnace with ore placed upon the grating the fire in chambers D islighted and the temperature raised sufficiently to cause a separation ofthe phosphorus from the ore, which temperature ought not to exceed 400Fahrenheit. During this process small jets of steam, so light as to forma watery vapor, are constantly thrown from the steam-pipes into thefurnace. The introduction of steam not only prevents the fusion of themetal in the ore,but the hydrogen set free through the decomposition ofthe vapor by contact with the heated iron ore combines with theeliminated phosphorus of the acid and carries it off through theescape-holes B as phosphureted hydrogen. An equal ratio is to bemaintained between the temperature of the ore and the volume of steamintroduced,as an increase of temperature without the accompanyingmoisture would increase the affinity of the phosphorus for iron andprevent a combination with the hydrogen. The phosphorus being removed,the iron attains a higher degree of oxidation.

We are aware that it is old to moisten the fuel with water, and that itis old to inject steam or watery vapor at different elevations in thestack during the calcining operation,

We are also aware that the application of steam, air, or salt is not newfor the purpose of desulphurizing ores, and this we also disclaim. y

We are also aware that it is not new to pile both the wood and the orein a furnace for the purpose of calcining the ore, as described.

We claim- The combination of a stack provided with the perforations B inits upper portion with the side furnace or furnaces, D,flues (J, and theperforated pipes A, arranged at difi'erent elevations inside of thestack, substantially as shown.

In testimony whereof we affix our signatures in presence of twowitnesses.

FERDINAND PROTZMAN. CHARLES ADAMS. ALFRED LONGMORE. Witnesses:

PHILIP BAKER, J AMES UULP.

